Ferromagnetic Layers in a Topological Insulator (Bi,Sb) 2 Te 3 Crystal Doped with Mn
Magnetic topological insulators (MTIs) have recently become a subject of poignant interest; among them, Z topological insulators with magnetic moment ordering caused by embedded magnetic atoms attract special attention. In such systems, the case of magnetic anisotropy perpendicular to the surface th...
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Published in | ACS nano Vol. 16; no. 12; pp. 20831 - 20841 |
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Main Authors | , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
27.12.2022
|
Subjects | |
Online Access | Get full text |
ISSN | 1936-0851 1936-086X |
DOI | 10.1021/acsnano.2c08217 |
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Abstract | Magnetic topological insulators (MTIs) have recently become a subject of poignant interest; among them, Z
topological insulators with magnetic moment ordering caused by embedded magnetic atoms attract special attention. In such systems, the case of magnetic anisotropy perpendicular to the surface that holds a topologically nontrivial surface state is the most intriguing one. Such materials demonstrate the quantum anomalous Hall effect, which manifests itself as chiral edge conduction channels that can be manipulated by switching the polarization of magnetic domains. In the present paper, we uncover the atomic structure of the bulk and the surface of Mn
Sb
Bi
Te
in conjunction with its electronic and magnetic properties; this material is characterized by naturally formed ferromagnetic layers inside the insulating matrix, where the Fermi level is tuned to the bulk band gap. We found that in such mixed crystals septuple layers (SLs) of Mn(Bi,Sb)
Te
form structures that feature three SLs, each of which is separated by two or three (Bi,Sb)
Te
quintuple layers (QLs); such a structure possesses ferromagnetic properties. The surface obtained by cleavage includes terraces with different terminations. Manganese atoms preferentially occupy the central positions in the SLs and in a very small proportion can appear in the QLs, as indirectly indicated by a reshaped Dirac cone. |
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AbstractList | Magnetic topological insulators (MTIs) have recently become a subject of poignant interest; among them, Z
topological insulators with magnetic moment ordering caused by embedded magnetic atoms attract special attention. In such systems, the case of magnetic anisotropy perpendicular to the surface that holds a topologically nontrivial surface state is the most intriguing one. Such materials demonstrate the quantum anomalous Hall effect, which manifests itself as chiral edge conduction channels that can be manipulated by switching the polarization of magnetic domains. In the present paper, we uncover the atomic structure of the bulk and the surface of Mn
Sb
Bi
Te
in conjunction with its electronic and magnetic properties; this material is characterized by naturally formed ferromagnetic layers inside the insulating matrix, where the Fermi level is tuned to the bulk band gap. We found that in such mixed crystals septuple layers (SLs) of Mn(Bi,Sb)
Te
form structures that feature three SLs, each of which is separated by two or three (Bi,Sb)
Te
quintuple layers (QLs); such a structure possesses ferromagnetic properties. The surface obtained by cleavage includes terraces with different terminations. Manganese atoms preferentially occupy the central positions in the SLs and in a very small proportion can appear in the QLs, as indirectly indicated by a reshaped Dirac cone. |
Author | Sánchez-Barriga, Jaime Frolov, Alexander S. Muntwiler, Matthias Bogomyakov, Artem S. Abakumov, Artem M. Vilkov, Oleg Yu Sirotina, Anna P. Amati, Matteo Usachov, Dmitry Yu Kokh, Konstantin Yashina, Lada V. Golyashov, Vladimir Tereshchenko, Oleg E. Gregoratti, Luca Fedorov, Alexander V. |
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BackLink | https://www.ncbi.nlm.nih.gov/pubmed/36378602$$D View this record in MEDLINE/PubMed |
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Keywords | magnetic topological insulators surface structure electron band structure photoelectron diffraction ferromagnetism ARPES |
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topological insulators with magnetic moment ordering... |
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Title | Ferromagnetic Layers in a Topological Insulator (Bi,Sb) 2 Te 3 Crystal Doped with Mn |
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